Abstract:
The complex permittivity $(\varepsilon=\varepsilon'-i\varepsilon'')$ of natural, modified, and irradiated zeolites as a function of the frequency of a variable electric field is measured. For Ba$^{2+}$-modified (doped) zeolite, the permittivity and dielectric loss tangent $(\tan\delta)$ as functions of the electric field frequency are found to decrease monotonically. When the irradiation dose rises to 10$^{15}$ cm$^{-2}$, the dielectric loss tangent reaches a maximum and then, starting from a dose of 3 $\times$ 10$^{16}$ cm$^{-2}$, sharply drops. Such behavior of $\tan\delta$ is assumed to be associated with Ba$^{2+}$- and irradiation-induced structural modifications in the unit cell of zeolite.
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